Vulnerability Description
containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd on Linux with the CRI plugin enabled can indefinitely block the drainExecSyncIO goroutine in internal/cri/server/container_execsync.go when CRI ExecSync is used by exec probes or lifecycle hooks that launch long-lived background child processes retaining standard input and output pipes. The input and output drain phase has no default timeout and did not stop when the request context was canceled, so repeated ExecSync invocations can accumulate blocked goroutines and host memory. The resulting resource exhaustion can cause the OOM killer to terminate containerd, leaving the container runtime unavailable until restart. Deployments not using containerd's CRI implementation and containers not running on Linux are not affected. This issue is fixed in versions 1.7.35, 2.0.12, 2.2.8, and 2.3.5.
Related Weaknesses (CWE)
References
- https://github.com/containerd/containerd/commit/22ccf4314d1fe0834f8e28f10d37d530
- https://github.com/containerd/containerd/commit/5a2a3a759b0d2ad8c821b33c3afc2089
- https://github.com/containerd/containerd/commit/9ec55f024041d0641f6d79841e45c878
- https://github.com/containerd/containerd/commit/eebea8c4c912f44b656c8295c9e6607a
- https://github.com/containerd/containerd/commit/ff39a972369e2f12fae561a58d658bbf
- https://github.com/containerd/containerd/releases/tag/v2.0.12
- https://github.com/containerd/containerd/releases/tag/v2.2.8
- https://github.com/containerd/containerd/releases/tag/v2.3.5
- https://github.com/containerd/containerd/security/advisories/GHSA-7jxh-36q5-gcqv
FAQ
What is CVE-2026-53495?
CVE-2026-53495 is a documented vulnerability. containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd on Linux with the CRI plugin enabled can indefinitely block the drainExecSyncIO goroutine in inter...
How severe is CVE-2026-53495?
CVSS scoring is not yet available for CVE-2026-53495. Check NVD for updates.
Is there a patch for CVE-2026-53495?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.